Antenna Type: Trimble Zephyr Geodetic (TRM41249.00) Dome Type: Tall SCIGN Radome (SCIT) IGS Name: TRM41249.00 SCIT Calibrated Frequencies: GPS L1, L2 UNAVCO provided 4 antennas with radomes to Geo++ for robotic calibration in 2016. The results will... Read More

Location: UNAVCO facility roof NE corner Author: Henry Berglund Contact: Berglund@unavco.org Introduction: Trimble currently offers two choke ring antenna designs for GNSS applications: The Trimble GNSS Choke Ring Antenna has a traditional Dorne... Read More

UNAVCO Resources: GNSS Antennas Dual frequency (L1/L2) Choke Ring Antennas provide geodetic-quality GNSS measurements for surveying, mapping, and research applications. Typical dual-frequency choke ring antennas maintain a stable phase center that... Read More

Trimble has indicated that there is an issue with their firmware that will cause the 5700 and R7 models to become inoperable after the GPS week roll over on 14 FEB 2016. The issue also affects the 4700/4800 series receivers too, but there is no... Read More

This article presents a comparison of measured signal to noise ratio (SNR) values observed from several  GNSS antenna types. The results presented below were collected using a monument located on the UNAVCO Facility Roof in Boulder, CO. Each... Read More

The following power tests were conducted on GPS and GNSS antennas using an Agilent N6705 DC Power Analyzer. The following tests show short, 1-minute averages of measured power consumption. The power use of each antenna was tested at two separate... Read More

Update: GPS/GNSS Interference From Iridium Data TransmissionsThe Iridium satellite communication system broadcasts in the 1610 to 1626.5 MHz band. UNAVCO Inc. uses iridium communication links to download GPS data from remote GPS stations. The L1 freq... Read More

Please use the numeric portion of WIFI SSID (Highlighted in GREEN) when recording the serial number for installation reports. The serial number highlighted in RED is needed for RMA's that require international shipping. Do not use the serial... Read More

* NetR9 internal UPS should be configured to only charge internal battery when system voltage is 13+ volts Read More

2019 Geological Society of America Annual Meeting Short Course, Phoenix, AZ 510. High Resolution Topography and 3D Imaging II: Introduction to Structure from Motion (SfM) Photogrammetry. Sat., 21 Sept., 8 a.m.–5 p.m Room 103AB, West... Read More